Needle Feed/Bottom Feed Changeover - JUKI LH-4128-7 Engineer's Manual

8. Needle feed/bottom feed changeover

[Bottom feed changeover]
1. Adjust the feed control dial to the minimum position
and loosen the nut
. Move the needle bar rocking rod
needle bar rocking rod arm
rod fixing base
2. For needle entry adjustments, the position of needle
entry can be adjusted by vertically moving the set-
screw of the needle bar rock fixing base. Since
then, the feed dog and throat plate should be replaced
with the bottom feed parts.
3. For needle and feed synchronism (timing) adjust-
ments, loosen the second setscrew
sprocket and then loosen the first setscrew after it
has been moved to the position as illustrated. In this
state, remove the first setscrew. Turn the hand wheel
until the position of the third setscrew is secured. At
that time, confirm that the engraved marker dot
the bottom shaft
seems to be tightened smoothly. In this state, mount
the removed first setscrew on the third setscrew and
fasten it based on the engraved marker dot
tighten the second setscrew.
4. Check the condition of hook adjustment.
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of the needle bar rocking rod
to the needle throwing
and fix it with the nut
of the bottom
is positioned where this shaft
from the
.
of
. Then